From: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
commit bf8975837dac156c33a4d15d46602700998cb6dd upstream.
We hardcode the maximum number of shared fences to 4, instead of
respecting num_fences. Use a minimum of 4, but more if num_fences
is higher.
This seems to have been an oversight when first implementing the
api.
Fixes: 04a5faa8cbe5 ("reservation: update api and add some helpers")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.17+
Reported-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20201124115707.406917-1-maarten.lankhorst@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma-buf/dma-resv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -161,7 +161,7 @@ int dma_resv_reserve_shared(struct dma_r
max = max(old->shared_count + num_fences,
old->shared_max * 2);
} else {
- max = 4;
+ max = max(4ul, roundup_pow_of_two(num_fences));
}
new = dma_resv_list_alloc(max);
